#include <stdio.h>

//https://www.nowcoder.com/practice/07e75d2b212b4a11b1525863ca3af02c?tpId=107&&tqId=33412&rp=1&ru=/ta/beginner-programmers&qru=/ta/beginner-programmers/question-ranking

int main() {
    printf("printf(\"Hello world!\\n\");\n");
    printf("cout << \"Hello world!\" << endl;");
    return 0;
}

